Background: Low-density lipoprotein cholesterol is an important marker highly associated with cardiovascular disease. Since the direct measurement of it is inefficient in terms of cost and time, it is common to estimate through the Friedewald equation developed about 50 years ago. However, various limitations exist since the Friedewald equation was not designed for Koreans. This study proposes a new low-density lipoprotein cholesterol estimation equation for South Koreans using nationally approved statistical data. Methods: This study used data from the Korean National Health and Nutrition Examination Survey from 2009 to 2019. The 18,837 subjects were used to develop the equation for estimating low-density lipoprotein cholesterol. The subjects included individuals with low-density lipoprotein cholesterol levels directly measured among those with high-density lipoprotein cholesterol, triglycerides, and total cholesterol measured. We compared twelve equations developed in the previous studies and the newly proposed equation (model 1) developed in this study with the actual low-density lipoprotein cholesterol value in various ways. Results: The low-density lipoprotein cholesterol value estimated using the estimation formula and the actual low-density lipoprotein cholesterol value were compared using the root mean squared error. When the triglyceride level was less than 400 mg/dL, the root mean squared of the model 1 was 7.96, the lowest compared to other equations, and the model 2 was 7.82. The degree of misclassification was checked according to the NECP ATP III 6 categories. As a result, the misclassification rate of the model 1 was the lowest at 18.9%, and Weighted Kappa was the highest at 0.919 (0.003), which means it significantly reduced the underestimation rate shown in other existing estimation equations. Root mean square error was also compared according to the change in triglycerides level. As the triglycerides level increased, the root mean square error showed an increasing trend in all equations, but it was confirmed that the model 1 was the lowest compared to other equations. Conclusion The newly proposed low-density lipoprotein cholesterol estimation equation showed significantly improved performance compared to the 12 existing estimation equations. The use of representative samples and external verification is required for more sophisticated estimates in the future.

A 12-year-old girl with nephrotic syndrome was admitted to Kosin University Gospel Hospital because of progressive generalized edema and weight gain for the last one month. From the eighth day of admission, she developed headache and generalized tonic seizures. Magnetic resonance imaging (MRI) of the brain showed multiple T2-high signal intensity lesions in the bilateral posterior parieto-occipital cortex and subcortical white matter. The convulsions responded to anticonvulsant and antihypertensive drugs but recurred again until she developed massive diuresis and became normotensive. Follow-up brain MRI 5 days later showed complete resolution of the previous abnormal lesions. The cause of Posterior Reversible Encephalopathy Syndrome (PRES) in our case remains unclear. Blood pressure has been only moderately elevated when the patient became symptomatic. Here, we report a case of minimal change nephrotic syndrome complicated by PRES with a literature review.
Antihypertensive Agents ; Blood Pressure ; Brain ; Child ; Diuresis ; Edema ; Follow-Up Studies ; Headache ; Humans ; Hypertension ; Magnetic Resonance Imaging ; Nephrosis, Lipoid ; Nephrotic Syndrome ; Seizures ; Weight Gain